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Lump Sum or Monthly Investing? What Usually Happens and Why People Still Split It

By Smart Budget Sheets November 10, 2026
Lump sum vs dollar-cost averaging: history and behaviour.

You have a sum to invest, say $24,000, from a bonus, an inheritance or savings. Invest it all now, or spread it over 12 months at $2,000 a month (dollar-cost averaging)?

What the history says

Markets have risen in most years, so investing the whole amount at once has usually ended ahead, roughly two-thirds of the time in studies of US and global markets over rolling periods. The reason is simple: money waiting in cash misses part of the average return.

Why spreading it can still make sense

  • Regret: if the market falls 20% the month after a lump sum, many people sell in panic. Spreading the purchase lowers that risk, and staying invested matters more than the entry date.
  • Cash is not idle: money waiting in a high-yield savings account still earns interest, which narrows the gap.
  • It matches income: for most people regular investing from each paycheck is not a choice at all, it is just how money arrives, and it is a great habit.

A middle path

Decide in advance and write it down: for example, invest half now and the rest over 6 months on fixed dates. A rule set ahead of time removes the temptation to time the market.

Example

$24,000 at a 7% average yearly return for 20 years grows to about $93,000. Delaying half of it by six months reduces the expected result only slightly; panic-selling after a drop can cost far more.

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General information, not financial advice. Figures are rounded examples.

#personalfinance #budgeting #investing
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